Bad miss, Undrivable

gdcpony · November 25th, 2008, 03:04 PM

The miss started last night on the way home. I have looked at spark and found it good at all cylinders. I just changed the fuel filter 6 months ago. I get a spray of fuel from the Shrader valve, but I don't have a gauge to check pressure. The inlet track is modified by a "PowerAid" TB spacer (was on the car when I bought it), and the air filter housing has been opened some (again before I bought it). The exhaust is a Mac 2.5 all the way back with cats and shorties (I would trade this for a GT set up in a second). Other than that it is stock. Tune up done 6 months ago and it had Seafoam through it a month ago. There is no code being thrown by the ECU.
I take good care of my cars so this is really bugging me. It feels like a constant thing until I rev it up high enough to hide it (3k). I get jerked down the road as the exhaust pops. It is BAD! Please help as this is my work car.
I have to get to work now (thank God I have a truck), but will check back at midnight. Thanks in advance.

04mustang232 · November 25th, 2008, 09:01 PM

"misses" are such a pain in the ass. Youll drive yourself crazy trying to find it.

Start your car in the dark and check and see if your spark is arcing somewhere, like on your manifolds.

Clean fuel injectors with seafoam.

Clean MAF sensor.

Check vacuum lines.

My car would miss to the point it was undrivable as well. Turned out it was a bad fuel injector. Thank god it was under warranty.

Is it throwing any engine codes?

gdcpony · November 26th, 2008, 12:50 AM

A friend who fills up his car at the same place I do says he had this problem last week and it was the gas. We filled up within a couple hours of each other. I added some drier and cleaner and drove it to work (I am suffering from whiplash!). No change yet.
I did notice it subsides- not quite completely- under heavy throttle. Not a good thing to use in the snow. It also is at its worst at 1200-1700 and operating temp.
There are no codes. I see no sparks unless I unplug something. I just Seafoam'd it a little while ago. I will clean the MAF and TB tomorrow after work (working days for the holiday shutdown).

stephen · November 26th, 2008, 01:11 PM

If you suspect water in the gas use up all of the gas and refill and also change the fuel filter. If it started suddenly bad gas is likely.

Also take the plugs out and take a look at them. I had a misfire at high speed that was due to heavy deposits on one plug. This is especially likely in the back cylinders (#3 and #6).

JTS · November 27th, 2008, 02:55 PM

Originally Posted by 04mustang232

"misses" are such a pain in the ass. Youll drive yourself crazy trying to find it.

Start your car in the dark and check and see if your spark is arcing somewhere, like on your manifolds.

Clean fuel injectors with seafoam.

Clean MAF sensor.

Check vacuum lines.

My car would miss to the point it was undrivable as well. Turned out it was a bad fuel injector. Thank god it was under warranty.

Is it throwing any engine codes?

+1.... I had the same problem i couldnt go past 20mph mine kept miss firing and I ended up taking out all my plugs one by one and i found that one of them was cracked so i put a new one in and it ran perfectly fine

gdcpony · November 30th, 2008, 10:31 AM

Thanks guys still driving out the bad crap. Decided to add some fuel system cleaner, and fill the tank at 1/2 tank. Seemed to help a little. I'll pull the plugs as soon as I run this out.

Hourofpain · November 30th, 2008, 01:50 PM

is it shaking?
can you hear it in your exhaust?
might be your coil pack

Dragonhunt · November 30th, 2008, 06:31 PM

My car is a 2000 Mustang and it does the same thing as your exactly same RPM range also. Mine is drivable, it just sputters/surges/misses at that range.

I put in plugs, wires (Durlalast) which I think are crap and I am going to change them this week, new plugs, PCV, Fuel Filter, Good 93 octane gas, cleaned air temp sensor.

I am going to test every sensor on the engine this week to find out what is causing this.

When you find out what caused you, please let me know and I will do the same.

Thanks

Dragonhunt · November 30th, 2008, 07:04 PM

Originally Posted by Hourofpain

is it shaking?
can you hear it in your exhaust?
might be your coil pack

Do these go bad often? My car has 86,000

Have you had one go bad?

dgt_mustang · November 30th, 2008, 07:07 PM

read the first paragraph fully, maybe this is your problem?

99-00 3.8L Mustang Driver's Side Valve Cover Fix

Dragonhunt · November 30th, 2008, 07:17 PM

Originally Posted by dgt_mustang

read the first paragraph fully, maybe this is your problem?

99-00 3.8L Mustang Driver's Side Valve Cover Fix

Thanks, I will look into it

Dragonhunt · November 30th, 2008, 07:19 PM

Originally Posted by dgt_mustang

read the first paragraph fully, maybe this is your problem?

99-00 3.8L Mustang Driver's Side Valve Cover Fix

This only happens (at least it feels this way between 1200-1700 prm's)

You think it could really be cause by oil in the cylinders?

dgt_mustang · November 30th, 2008, 08:58 PM

possibly, seems alot of people had problems with that.

WLJohnson05 · November 30th, 2008, 09:00 PM

hell i think ima be building a catch can type thing for mine when i get the chance instead

Dragonhunt · November 30th, 2008, 10:01 PM

Look at this:

99-00 3.8L Mustang Driver's Side Valve Cover Fix

WLJohnson05 · November 30th, 2008, 10:09 PM

Originally Posted by Dragonhunt

Look at this:

99-00 3.8L Mustang Driver's Side Valve Cover Fix

yea i looked at it, my problem is im turbo'd so i cant have that boost going down in the crankcase so it would be easier for me to run a catch can somewhere with a line coming from each pcv hole and have it run to a central location where a breather is and have it vent there that way the can will catch the oil and still vent the pressure without boost going down thru the pcv valves

Dragonhunt · December 18th, 2008, 08:42 PM

Well, I am going to do a compression test, I think I have a burnt valve.....

We will see soon

November 25th, 2008, 03:04 PM	#1
gdcpony Newbie Join Date: Nov 2006 Posts: 37 iTrader: 0 reviews	Bad miss, Undrivable The miss started last night on the way home. I have looked at spark and found it good at all cylinders. I just changed the fuel filter 6 months ago. I get a spray of fuel from the Shrader valve, but I don't have a gauge to check pressure. The inlet track is modified by a "PowerAid" TB spacer (was on the car when I bought it), and the air filter housing has been opened some (again before I bought it). The exhaust is a Mac 2.5 all the way back with cats and shorties (I would trade this for a GT set up in a second). Other than that it is stock. Tune up done 6 months ago and it had Seafoam through it a month ago. There is no code being thrown by the ECU. I take good care of my cars so this is really bugging me. It feels like a constant thing until I rev it up high enough to hide it (3k). I get jerked down the road as the exhaust pops. It is BAD! Please help as this is my work car. I have to get to work now (thank God I have a truck), but will check back at midnight. Thanks in advance. __________________ Marines: Giving the enemy the opportunity to die for their cause since 1775. Guns: Giving us freedom since we learned how to shoot Mustangs: Giving gearheads a reason to exist since 1964 Turbos: Giving me a reason to appreciate all the above.

November 30th, 2008, 01:50 PM	#7
Hourofpain Hardcore Enthusiast 2005 Torrid Red GTO m6 Join Date: Mar 2007 Location: Virginia Beach Posts: 1,524 iTrader: 0 reviews	is it shaking? can you hear it in your exhaust? might be your coil pack __________________ 1996 Cobra To be sold... 2005 M6 Twin Turbo GTO Torrid Red Fully Forged LS2 Block Built to handle 1000RWHP. Fully ported Dart Heads. Edelbrock Jr Intake. Custom cut upper intake plenum. APS twin Turbo System with APS twin Fuel pumps.

November 30th, 2008, 09:00 PM	#14
WLJohnson05 MM's Database Error 2004 Mustang V6 322.8 rwhp Join Date: Mar 2007 Location: VA Posts: 13,285 iTrader: 9 reviews	hell i think ima be building a catch can type thing for mine when i get the chance instead __________________ I'm trying to get rid of this stuff, feel free to make me an offer!: SCT Mass Air Flow Sensor $200 Tial Wastegate Springs $40 (10psi and 3.6psi)

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November 26th, 2008, 12:50 AM	#3
gdcpony Newbie Join Date: Nov 2006 Posts: 37 iTrader: 0 reviews	A friend who fills up his car at the same place I do says he had this problem last week and it was the gas. We filled up within a couple hours of each other. I added some drier and cleaner and drove it to work (I am suffering from whiplash!). No change yet. I did notice it subsides- not quite completely- under heavy throttle. Not a good thing to use in the snow. It also is at its worst at 1200-1700 and operating temp. There are no codes. I see no sparks unless I unplug something. I just Seafoam'd it a little while ago. I will clean the MAF and TB tomorrow after work (working days for the holiday shutdown). __________________ Marines: Giving the enemy the opportunity to die for their cause since 1775. Guns: Giving us freedom since we learned how to shoot Mustangs: Giving gearheads a reason to exist since 1964 Turbos: Giving me a reason to appreciate all the above.

November 26th, 2008, 01:11 PM	#4
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,262 iTrader: 0 reviews	If you suspect water in the gas use up all of the gas and refill and also change the fuel filter. If it started suddenly bad gas is likely. Also take the plugs out and take a look at them. I had a misfire at high speed that was due to heavy deposits on one plug. This is especially likely in the back cylinders (#3 and #6).

November 30th, 2008, 10:31 AM	#6
gdcpony Newbie Join Date: Nov 2006 Posts: 37 iTrader: 0 reviews	Thanks guys still driving out the bad crap. Decided to add some fuel system cleaner, and fill the tank at 1/2 tank. Seemed to help a little. I'll pull the plugs as soon as I run this out. __________________ Marines: Giving the enemy the opportunity to die for their cause since 1775. Guns: Giving us freedom since we learned how to shoot Mustangs: Giving gearheads a reason to exist since 1964 Turbos: Giving me a reason to appreciate all the above.

November 30th, 2008, 06:31 PM	#8
Dragonhunt Newbie Join Date: Oct 2008 Posts: 35 iTrader: 0 reviews	My car is a 2000 Mustang and it does the same thing as your exactly same RPM range also. Mine is drivable, it just sputters/surges/misses at that range. I put in plugs, wires (Durlalast) which I think are crap and I am going to change them this week, new plugs, PCV, Fuel Filter, Good 93 octane gas, cleaned air temp sensor. I am going to test every sensor on the engine this week to find out what is causing this. When you find out what caused you, please let me know and I will do the same. Thanks

November 30th, 2008, 10:01 PM	#15
Dragonhunt Newbie Join Date: Oct 2008 Posts: 35 iTrader: 0 reviews	Look at this: 99-00 3.8L Mustang Driver's Side Valve Cover Fix

December 18th, 2008, 08:42 PM	#17
Dragonhunt Newbie Join Date: Oct 2008 Posts: 35 iTrader: 0 reviews	Well, I am going to do a compression test, I think I have a burnt valve..... We will see soon

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